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Possible juvenile ceratopsoid ilium from Cenomanian of Utah

Ben Creisler

A new paper:

Kenneth Carpenter & Richard L. Cifelli (2016)
A possible juvenile ceratopsoid ilium from the Cenomanian of central
Utah, U.S.A.
Cretaceous Research 60: 167–175

We describe a small ilium, with fibrous texture characteristic of
juvenile bone, from the lower Cenomanian of central Utah, U.S.A. The
ilium was recovered from the upper part of the Mussentuchit Member of
the Cedar Mountain Formation. The ilium most closely resembles that of
immature ceratopsid ilia referred to Agujaceratops mariscalensis from
the Campanian Aguja Formation of southern Texas, U.S.A. Both have
everted dorsal margins over the iliac body, subhorizontal
postacetabular processes, and laterally compressed, anteroventrally
curved preacetabular processes. If correctly identified, the small
ilium from the Cedar Mountain Formation is the oldest ceratopsid or
ceratopsoid known, and shows that the diversity of early ceratopsians
was greater than previously realized.